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Cannot extract a capabilities from the request [{"javascriptEnabled":false,"browserName":"firefox","class":"org.openqa.selenium.remote.DesiredCapabilities"}]
org.openqa.grid.common.exception.GridException: Cannot extract a capabilities from the request [{"javascriptEnabled":false,"browserName":"firefox","class":"org.openqa.selenium.remote.DesiredCapabilities"}]
                                                
                                        	at org.openqa.selenium.remote.RemoteWebDriver.throwIfResponseFailed(RemoteWebDriver.java:439)	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:401)	at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:74)	at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:61)	at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:69)	at com.selenium.gird.Google.beforeClass(Google.java:30)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)	at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)	at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)	at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138)	at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175)	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107)	at org.testng.TestRunner.privateRun(TestRunner.java:767)	at org.testng.TestRunner.run(TestRunner.java:617)	at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)	at org.testng.SuiteRunner.access$0(SuiteRunner.java:333)	at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:368)	at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)